001: /*
002: * $Header: /home/cvs/jakarta-commons/primitives/src/java/org/apache/commons/collections/primitives/AbstractDoubleCollection.java,v 1.3 2003/10/16 20:49:36 scolebourne Exp $
003: * ====================================================================
004: * The Apache Software License, Version 1.1
005: *
006: * Copyright (c) 2003 The Apache Software Foundation. All rights
007: * reserved.
008: *
009: * Redistribution and use in source and binary forms, with or without
010: * modification, are permitted provided that the following conditions
011: * are met:
012: *
013: * 1. Redistributions of source code must retain the above copyright
014: * notice, this list of conditions and the following disclaimer.
015: *
016: * 2. Redistributions in binary form must reproduce the above copyright
017: * notice, this list of conditions and the following disclaimer in
018: * the documentation and/or other materials provided with the
019: * distribution.
020: *
021: * 3. The end-user documentation included with the redistribution, if
022: * any, must include the following acknowledgement:
023: * "This product includes software developed by the
024: * Apache Software Foundation (http://www.apache.org/)."
025: * Alternately, this acknowledgement may appear in the software itself,
026: * if and wherever such third-party acknowledgements normally appear.
027: *
028: * 4. The names "The Jakarta Project", "Commons", and "Apache Software
029: * Foundation" must not be used to endorse or promote products derived
030: * from this software without prior written permission. For written
031: * permission, please contact apache@apache.org.
032: *
033: * 5. Products derived from this software may not be called "Apache"
034: * nor may "Apache" appear in their names without prior written
035: * permission of the Apache Software Foundation.
036: *
037: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
038: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
039: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
040: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
041: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
042: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
043: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
044: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
045: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
046: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
047: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
048: * SUCH DAMAGE.
049: * ====================================================================
050: *
051: * This software consists of voluntary contributions made by many
052: * individuals on behalf of the Apache Software Foundation. For more
053: * information on the Apache Software Foundation, please see
054: * <http://www.apache.org/>.
055: *
056: */
057:
058: package org.apache.commons.collections.primitives;
059:
060: /**
061: * Abstract base class for {@link DoubleCollection}s.
062: * <p />
063: * Read-only subclasses must override {@link #iterator}
064: * and {@link #size}. Mutable subclasses
065: * should also override {@link #add} and
066: * {@link DoubleIterator#remove DoubleIterator.remove}.
067: * All other methods have at least some base implementation
068: * derived from these. Subclasses may choose to override
069: * these methods to provide a more efficient implementation.
070: *
071: * @since Commons Primitives 1.0
072: * @version $Revision: 1.3 $ $Date: 2003/10/16 20:49:36 $
073: *
074: * @author Rodney Waldhoff
075: */
076: public abstract class AbstractDoubleCollection implements
077: DoubleCollection {
078: public abstract DoubleIterator iterator();
079:
080: public abstract int size();
081:
082: protected AbstractDoubleCollection() {
083: }
084:
085: /** Unsupported in this base implementation. */
086: public boolean add(double element) {
087: throw new UnsupportedOperationException(
088: "add(double) is not supported.");
089: }
090:
091: public boolean addAll(DoubleCollection c) {
092: boolean modified = false;
093: for (DoubleIterator iter = c.iterator(); iter.hasNext();) {
094: modified |= add(iter.next());
095: }
096: return modified;
097: }
098:
099: public void clear() {
100: for (DoubleIterator iter = iterator(); iter.hasNext();) {
101: iter.next();
102: iter.remove();
103: }
104: }
105:
106: public boolean contains(double element) {
107: for (DoubleIterator iter = iterator(); iter.hasNext();) {
108: if (iter.next() == element) {
109: return true;
110: }
111: }
112: return false;
113: }
114:
115: public boolean containsAll(DoubleCollection c) {
116: for (DoubleIterator iter = c.iterator(); iter.hasNext();) {
117: if (!contains(iter.next())) {
118: return false;
119: }
120: }
121: return true;
122: }
123:
124: public boolean isEmpty() {
125: return (0 == size());
126: }
127:
128: public boolean removeElement(double element) {
129: for (DoubleIterator iter = iterator(); iter.hasNext();) {
130: if (iter.next() == element) {
131: iter.remove();
132: return true;
133: }
134: }
135: return false;
136: }
137:
138: public boolean removeAll(DoubleCollection c) {
139: boolean modified = false;
140: for (DoubleIterator iter = c.iterator(); iter.hasNext();) {
141: modified |= removeElement(iter.next());
142: }
143: return modified;
144: }
145:
146: public boolean retainAll(DoubleCollection c) {
147: boolean modified = false;
148: for (DoubleIterator iter = iterator(); iter.hasNext();) {
149: if (!c.contains(iter.next())) {
150: iter.remove();
151: modified = true;
152: }
153: }
154: return modified;
155: }
156:
157: public double[] toArray() {
158: double[] array = new double[size()];
159: int i = 0;
160: for (DoubleIterator iter = iterator(); iter.hasNext();) {
161: array[i] = iter.next();
162: i++;
163: }
164: return array;
165: }
166:
167: public double[] toArray(double[] a) {
168: if (a.length < size()) {
169: return toArray();
170: } else {
171: int i = 0;
172: for (DoubleIterator iter = iterator(); iter.hasNext();) {
173: a[i] = iter.next();
174: i++;
175: }
176: return a;
177: }
178: }
179: }
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